Automatic damper



LANDERSON.

AUTOMATIC DAMPER.

APPLiCA' iOIP FZLZD l" Patented July 22) [/v VE/WOR,

lated by JOHN ANDERSON, 0F DULUTH, MIQNESOTA.

are.

AUTOMATIC DAMPER.

Specification of Letters Ifatent.

Applic'ation filed March 18, 1919. I Serial No. 283,340.

x To all whom it may concern:

Be it known that I, JOHN ANDERSON, a citizen of the United States, luth, in the county of StjLouis and State of Minnesota, have invented certain new and useful Improvements in Automatic Dampers, of which'the following is a specification, reference being had therein to the accompanyingdrawing. 10

This invention relates to dampers for fiues and has special reference to a novel form of such which is automatically reguthe upward draft in the flue.

The principal object is to produce a practical and eflicient device of this character.

Another object is that of providing simple and practical adjustable controlling means for the regulator.

Other ob ects and advantages will appear in the further description of the invention.'

Referring to the accompanying drawings forming part of this application and in which like reference characters indicatelike parts:

Figure 1 is a vertical central sectional view of the tubular housing containing the damper and which latter is shown in elevation in its noperative positlon,

F1g. 2 1s a similar View taken at rlghtangles to Fig. 1 and illustrating the damperin operative position, and V Fig. 3 is a side elevation of a fragmental portion of the damper housing, showing the damper regulator in elevation. 1 The embodiment'pf the invention here shown is'designed especially for installation, within a suitable enlar ement of the flue in which it is placed. his enlargement, or

drum, in the flue comprises two telescopic sections 1 and 2,.the latter being made to fit snugly within the former.

The unions of the two portions 1 and 2, with their respective sections of the flue 3, are inclined, as at 4, forming a gradually taperedconnection thereof.

The supporting frame ofthe damper-oper ating mechainsm 1s rectangular in form and comprises the end walls5 and 6 and the slde walls 7 and 8', they being, if preferred, of

one continuous strip of metal. However, I.

havefound it convenient to construct said frame with the end walls 5 and 6 of considerably greater thickness than the slde walls. This frame is made to fit snugly within the smaller section 2 of the drum 1 and 2, its lowermost corners resting upon nection between the section 2 a residing at-Du-' the upper annularangle-ofthe tapered cond its respectlve portion of thejflue 3.

When .the device is thus placed within the portion 2 of the drum, the portion 1 is slid down over it until the bevel 4 engages the upper corners of the frame, which results in a compact and pleasing external effect of the drum.

A shaft 9 is pivotally and centrally 13 thereupon, both of which are jammed and held in place by a suitable nut 14. Radially extending from two opposite sides of the hub 12 are the two shafts 15, upon which are hingedly mounted the two semi-circular Patented July 2a, was.

halves 16, which comprise the closing ele- 'ment or the damper proper. These halves have free pivotal action on the shafts 15 and are actuated wholly by centrifugal force when carried about with the shaft 9.

Each half 16 has mounted thereupon, ad-

jacent itsllowermost peripheral edge, a.suit-. able hemispherically shaped weight 17 and by which the throw damper is governed.

yoke or cross-head '18 is of the halves of the and pivotally carries, at 19, upon its radially extending opposed arms, depending rods 20,

I the lower ends of which are pivotally'connected, as at 21, to the outer faces and ap proximately centrally of the halves 16 of the. damper.

By this connection the two halves of the damper are'obliged to operate uniformly the damper will causeithe cross-head 18 to reciprocate vertically upon the shaft 9, and

it is apparent that any restriction of the upward movement of the cross-head 18 will slidably mounted upon the shaft 9 above the nut .14

and simultaneously and any movement of limit the radial throw' of the halves of the L damper. To predeterminethe extent of this action of the damper, I provide a horizon? tally disposed member 22, pivotally mounted\ at 23 in the depending bracket 24, fixed to as at 29, and the opposite end of the said rod carries an enlarged sleeve 30 having a rectangular shaped hole 31 in the outer end thereof and into which hole may be thrust the flat-headed pin 32.

Upon the outer end of the flat-headed pin 32 is. securely fixed, by a suitable rivet or pin 33, the balancing arm 34:, having suitable notches therein in which the counterweight 35 may be placed to determine the vertical limits of the cross-head 18.

When it. is not desired to thus regulate the throw of the damper the counter-weight 35 may be hooked into a suitable hole in the short end of the balancing arm 34:, as shown in Fig. 3, when the damper will be free to operate to its normal liinits. 1

Upon the shaft 9, adjacent its lower end I is securely fixed by suitable jam nuts 36 and 37, or otherconvenient means, the propelling wheel 38, made of thin sheet metal and having any suitable number of beveled buckets or blades to insure the proper".rotating of the shaft 9.

From the above it is evident that any considerable upward draft of air in the flue in which this device is installed, will cause the propellerwvheel torotate, thus rotating the shaft 9 and causing the halves 16 of the damper to operate, as above described.

When the halves of the damper are swung outwardly, it is obvious that the draft of a1r up the flue will be checked and thus slow down the rotation of the "propeller wheel, resulting in a limited uniform draft through the flue and which limitations may be governed or set by the hand operated mechanism before described.

I am aware that somewhat similar devices of this nature have been patented and, therefore, do not claim broadly the idea of an automatically controlled damper, but the novel patentable features of my present in vention are deemed to be a decided advance in the art.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a flue damper of the character described, comprising a vertically disposed shaft, means for rotating said shaft and a contrifugally operated damper, of a vertically reciprocable crosshead pivotally attached to the damper, horizontally disposed cooperating means extending to the exterior of the flue and manually adjustable therefrom;

2. T he combination with a flue damper of the character described comprising a verti' cally disposed shaft, means for rotating said shaft and a centrifugally operated damper,

of cboperating vertically reciprocable means attached to the movable sections of the damper and means regulated from the ex terior of the flue whereby the limit of the 'vertically reciprocable means may be predetermined.

3. In combination, a flue drum, a rectangular shaped frame slid-ably insertible wlthin the drum, a rotatable shaft centrally mounted within the frame, a propeller wheel fixed to the shaft, a two-part hingedly suspended damper carried upon the shaft, means whereby the halves of the damper operate uniformly, horizontally disposed means for regulating the throw of the last mentioned means and extending to a point adjacent the wall of one of the halves of the drum, and means Within the drum whereby the lattermay be set at a predetermlned point of operation.

In testimony whereof I have hereunto affixed my signature in the presence of two witnesses.

JOHN ANDERSON. Witnesses:

A. M. OUELLETTE, S. Geo. STEVENS. 

